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<li><p>数组将数字与对象联系起来。保存的是类型明确的对象，查询对象时，不需要对结果做类型转换。它也可以是多维的，可以保存基本类型的数据。但是数组一旦生成，其容量就不可改变。</p>
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<li><p>Collection保存单一的元素，而Map保存相关联的键值对。容器不能持有基本类型，但是自动包装机制会仔细地执行基本类型到容器中所持有的包装器类型之间的双向转换。</p>
</li>
<li><p>List与数组类似，也建立数字索引与对象的关联，都是排好序的容器。不同的是，List可以自动扩充容量。</p>
</li>
<li><p>如果要进行大量的随机访问，就应该使用ArrayList；如果是要经常从表中间插入或删除元素，就应该使用LinkedList。</p>
</li>
<li><p>各种Queue以及栈的行为，由LinkdedList提供支持。</p>
</li>
<li><p>Map是一种将对象（而非数字）与对象相关联的设计。HashMap设计用来快速访问，而TreeMap保持“键”始终处于排序状态，所以没有HashMap快。LinkedHashMap保持元素插入的顺序，但是也通过散列提供了快速访问能力。</p>
</li>
<li><p>Set不接受重复元素。HashSet提供最快的查询速度，而TreeSet保持元素处于排序状态。LinkedHashSet以插入顺序保存元素。</p>
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<li><p>新程序中尽量少使用过时的Vector,Hashtable和Stack。</p>
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